Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe253ee7732ac3e5…

MALICIOUS

PDF

95.6 KB Created: 2021-08-17 17:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d4a198b2f4dd77d2a8e76b4ad0eef29 SHA-1: 58e9a0f25cc49e0f827354414b0d30d2b020b4ba SHA-256: fe253ee7732ac3e5cb0b84de9542fb8f5d980d273abce7e52234f3016defa926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3f6058a0---loforimebefoxojawubodi.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0ark5fc56u015pn6idmj1gqojq/pufeno.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/24144640286.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/16aj8cgejp5b9unuqbrru47r0p/76338874159.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/aueet8jldlt0doh76fguar71a3/61987035348.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/sonosuma.pdfIn PDF document text
    • http://sivam.pl/files/file/83360464901.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/762fee703a7e4b250203d40962fa1355/nabupeviwolojapanarif.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/vavotalezogajuvesa.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/26fac9cd66deff329d2b7a3c27269ee9/7745583778.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/delibu.pdfIn PDF document text
    • http://premium-h.info/files/files/91566590211.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/58601814989.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8710d5a378---12713764668.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/45778924854.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/65546817735.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/pigovunokunoru.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160afae80250ac---madarekowupadakivuvi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/gomefujowogorugana.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4ca6b8ec---15829702077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=can+you+renew+your+california+real+id+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A84 10536 bytes
SHA-256: 45a57e085b247579d378b50c594f91e51b077e2f1a44e4fa5e9e0e175e5d82f3
font_02_sfnt_off000142a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A8 17504 bytes
SHA-256: d3ab390182fa960084c818226fcf3b3fa423153074c4ad5874a5c8b2f96d9bd8